Question

Rewrite the following statements after correction, if necessary
(a) Groups have elements with consecutive atomic numbers.
(b) Periods are the horizontal rows of elements.
(c) Isotopes are the elements of the same group.

Answer 1

Answer:

1. I have little doubt,

2.no change

3.isotopes are having same atomic no.,but mass different

Answer 2

Isotopes are Elements with Same Atomic but Different Mass Number

Explanation:

(a) The elements are arranged consecutively as per atomic numbers in Periods.

(b) This Statement is Correct that Periodic are the horizontal rows of elements.

(c) This Statement is Correct that Isotopes are the elements of the same group.